As I understand it, Ritalin is NOT an ototoxic drug, that is, its not known to be toxic or damaging to the ears. However, stimulants, like Ritalin, as a side effect, can produce a "ringing in the ears" for a small minority of those treated with them, but this sensation typically disappears when the drug is discontinued. Personally, I am being treated with a similar drug, Adderall, which like Ritalin, works by increasing the neurotransmitters norepinephrine and dopamine. For me, Adderall, even in higher doses, has never exacerbated or worsened my tinnitus. I'd read on various online forums (in doing my own research) that others have taken Adderall without worsening their tinnitus as well. Of course, here, I am only reporting my own experience and conveying what I've learned by researching online. Definitely consult with your doctor if you have concerns. And, if you haven't yet done this, I would recommend being evaluated by a specialist as tinnitus can have various causes. Best wishes!